1. Logic or thinking that is based on random decisions or personal whims rather than on evidence, facts, or established principles
The judge's decision was criticized as arbitrary reasoning rather than legal precedent.
A decisão do juiz foi criticada como raciocínio arbitrário em vez de jurisprudência.
2. Reasoning that lacks logical consistency or justification
Without empirical data, the consultant's conclusions were merely arbitrary reasoning.
Sem dados empíricos, as conclusões do consultor eram apenas raciocínio arbitrário.